RPC Server is unavailable

I've suddenly encountered network sharing problems I can't seem to get
past. I get an error when
trying to share files: The RPC Server is Unavailable. I've done the normal
google and MS KB search and nothing I've found works. I can't think what
I've done lately that would have an effect on this. I've even shut down the
firewall which has done no good. This is something that happened only
recently
If anyone has any ideas, I'm willing to try it.
Thanks

Paul

Check to see if the RPC service is running. (Not sure exactly what it might
be named in Vista).

Start > Run > Services.msc (or type in Search box if you do not have Run).

Thanks for the info but, it appears the service is greyed out and I can't
shut it down or start it up again. Is there some command I can run to do
this since it's not accessible within the services menu?

Oh, you have to run services.msc as Admin to change anything, but the
service appears to be running anyway.

ss.

I found 2 unfamiliar entries in startup....secure 16 & secure 32 which I
unchecked and rebooted. I noticed also (didn't see this before) that both
my workgroup name and computer name in the system info show as '
unavailable'. I can't even change the workgroup name.
Paul